X-Emby-Authorization at the remaining request builders, and api_key= in the player-facing URLs, become Authorization and ApiKey. Jellyfin 12.0 disables X-Emby-Authorization, X-Emby-Token, X-MediaBrowser-Token, the Emby scheme and the api_key query parameter by default — and a migration (DisableLegacyAuthorization) turns them off on servers upgraded from 10.11 as well, so this is not confined to fresh installs. A client using them stops working against an upgraded server rather than degrading. Verified at source level rather than inferred: AuthorizationContext.cs is byte-identical between v10.11.5 and v12.0 apart from whitespace. The only change is the default of the gate that guards the legacy spellings. Authorization with the MediaBrowser scheme, and ApiKey as a query parameter, are ungated in both trees — and the server itself emits ApiKey in both (StreamInfo.cs). So one spelling is correct everywhere and no capability flag is involved. Also adds ServerCompatibility to ServerInfo: an opaque verdict the frontend renders without ever comparing a version number, with three states rather than a boolean. A server newer than this build is usable, not refused; an unreadable version string is not grounds for refusal either. Only a server below the floor is refused. TRACES: UR-085 | DR-286, DR-287 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

JellyTau
A cross-platform Jellyfin client built with Tauri, SvelteKit, and TypeScript.
Business logic lives in a Rust backend; a UI-rich Svelte frontend handles presentation and talks to it over Tauri's IPC. Targets Linux (libmpv) and Android (ExoPlayer).
Getting Started
This project uses bun as its package manager.
# Activate the Rust environment (fish shell)
source "$HOME/.cargo/env.fish"
# Install dependencies
bun install
# Run in development
bun run tauri dev
# Type-check the frontend
bun run check
# Build for Linux
bun run tauri build
# Build for Android
bun run tauri android build
For the full set of build, test, and Android helper scripts, see scripts/README.md.
Documentation
| Topic | Location |
|---|---|
| Architecture overview & subsystem docs | docs/architecture/ |
| Requirements, traceability & technical debt | docs/requirements.md |
| Build & release process | docs/build/build-release.md |
| Docker builds | docs/build/docker.md |
| Traceability tooling & CI | docs/traceability.md, docs/traceability-ci.md |
| Release checklist | docs/release-checklist.md |
| UX flows | docs/ux-flows.md |
| CI operations (builder image, secrets, runner) | docs/build/ci-operations.md |
Contributing
CONTRIBUTING.md covers the setup, the gates a change has to pass, and the two rules that catch people out (bug fixes start with a failing test; Jellyfin's taxonomy stays in Rust). Please also read the Code of Conduct.
Found a security problem? Do not open an issue — see SECURITY.md.
Verifying a download
Every release publishes SHA256SUMS covering all of its artifacts, plus an SBOM
of what went into the build:
sha256sum -c SHA256SUMS
Desktop builds update themselves from Settings → Updates, verifying each payload against JellyTau's signing key before installing. Android installs are handled by the system installer, so the app links to the releases page instead.
Recommended IDE Setup
VS Code + Svelte + Tauri + rust-analyzer.
License
MIT